Earplug



FIG. 1 is a perspective view of the new design;

FIG. 2 is a front elevational view thereof, it being understood that when rotated, all undisclosed surfaces in elevation are a mirror image;

FIG. 3 shows a bottom plan view thereof; and,

FIG. 4 shows a top plan view thereof. 

The ornamental design for an earplug, as shown and described. 